预备弯曲根管时根管偏移的实验研究

Experimental study of root canal deviation during instrumentation of the curved root canals

目的:定量研究弯曲根管预备过程中根管的偏移。方法:使用不锈钢K锉按常规法预备8个弯曲人工根管,根管预备过程中对根管、根尖孔进行微距摄影,用图像分析软件Image-ProPlus对根管的形态和位置变化进行测量、分析。结果:根管预备时随着锉号的递增,弯曲根管逐渐被拉直,表现为根管弯曲角度逐渐减小,弯曲半径、根管轮廓面积逐渐增大,根管口、根尖孔被拉开,根管壁出现3个过度切削区。结论:预备弯曲根管时,根管不同部位的偏移方向、偏移距离并不相同,掌握弯曲根管的解剖形态以及根管器械的力学性能,有助于准确估计根管偏移的大小和方向。

AIM：To evaluate root canal deviation during instrumentation of curved root canals. METHODS： 8 curved artificial root canals were prepared with stainless steel K files by routine technique, The root canals were photographed by digital camera. The images were analysed by the software Image -Pro Plus. The shapes and positions of the root canals were measured and analysed. RESULTS： The curved root canals were straightened step by step during the process of canal preparation. The angles of the root canal curvature decreased while the radius of the curvature and the areas of the canal contour increased. Apical zipping and canal elbow were created, 3 over - cutting zones appeared at the wall of the root canals. CONCLUSIONS ： The direction and degree of the canal deviation varied with the level of the root canals during instrumentation of curved root canals. Familiar of the morphology of curved root canal and mechanical features of canal instruments would be helpful for avoiding canal deviation.